eeeves



JOHN Jos. LAHAVE ANI) s. r. REEVES, oE READING,- PENNSYLVANIA.

Letters Patent No. 60,74'8,dated January l, 1867. i I A IMPROVEMENT IN SLIDE VALVES.

TO ALL WHOM IT MAY` CONCERN:

- Be it known that we, J'. LAHAYE and S.` T. REEVES, of Reading, Berks county, Pennsylvania, have invented certain improvements in Slide Valves; and weido herebydeclarc the followingI to be afull, clear, and exact description of the same, reference being had to the accompanying drawing, and to the letters of reference marked thereon. f

. Our invention consists in the arrangement 'of a valve having a recess containing an elasticmateral, with a plate having a rib which projects Yinto the said recess, as fully described hereafter,-so that the said elastic mate rial shall act as aspring to maintain the valve against its seat, and as a packing to prevent the passage of'stcam between the ribbed plate andA the valve.

A In order to enable others skilled'in the art to make'and use our invention, we will now proceed to describe its construction and opera-tion. I 4

On reference tothe accompanying drawing, which forms a part of this specification- Figure l is a sectional elevation of a. valve-chest and slide valve with our improvements.

Figure 2 is a plan view of part of the valve; and

Figure 3, an inverted plan view of another part of the valve.

Similar letters refer to similar parts throughout the several views.

A is a valve-chest in which slides a valve, B, of the ordinary construction, the latter being connected to the usual spindle, C, which passes through a stuling-box in front of the valve-chest. To the top of the valve is secured a plate, a, in which -is an annular recess, z', (fig. 2,) and in thev latter'is lfitted a ring, c, of gum, cork, or other elastic packing material. Into the recess, x, projects an annular rib, e, on a plate, D, the upper face of which bears against a steel plate, E, secured to the under face of the valve-chest cover, F; In the plate, D, is a circular opening, y, andl in the plate, E, and in the chest cover above it, is an opening, f. Thel elastic material in the rece-ss, z, serves as a spring to force the valve and the plate D apart from each other, so that the valveis caused to bear on its seat, while the plate D is maintained tightly against the plate It will be seen that while thetwo plates are thus separated the elastic material is compressed within the recess, and is caused to bear iirmly against the sid'es of the latter, and against the rib, e, so as to act as a packing, which prevents the escapo of steam from the chest, between the plates a and D. Should either of the plates, D or E, become so worn as to permit the passage of steam between them, it will escape through theopening, f, from the chest, so that any pressure upon the top of the valve,.other than that of the atmosphere Ais prevented. It will be apparent that the recesses, z, and the rib, c, may be of any desired form. a

We elaii'n the arrangement of the valve B, with its recess containing an elastic packing material, and theV plate D; with its rib, e, substantially as and fot the purpose described. i

In testimonywhereof we have signed our names to this speciiication in thepresence oftwo subscribing witnesses.

JOHN Jos. LAHAYE, s; T. REEVES.

Witnesses: V

CnAnLEs E. Fosrnn, JOHN WHITE. 

